9778734021742 has 16 divisors (see below), whose sum is σ = 16763594025312. Its totient is φ = 4190873512320.

The previous prime is 9778734021737. The next prime is 9778734021757. The reversal of 9778734021742 is 2471204378779.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5049642 + ... + 6712402.

It is an arithmetic number, because the mean of its divisors is an integer number (1047724626582).

Almost surely, 2^{9778734021742} is an apocalyptic number.

9778734021742 is a deficient number, since it is larger than the sum of its proper divisors (6984860003570).

9778734021742 is a wasteful number, since it uses less digits than its factorization.

9778734021742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2082843.

The product of its (nonzero) digits is 33191424, while the sum is 61.

The spelling of 9778734021742 in words is "nine trillion, seven hundred seventy-eight billion, seven hundred thirty-four million, twenty-one thousand, seven hundred forty-two".